A battery pack assembly single-sided welding device

Abstract

This invention belongs to the field of welding technology, specifically disclosing a single-sided welding device for battery pack assemblies. The device includes a welding table, with rails mounted at both ends on one side of the welding table. The two rails are connected to a ball screw sliding mechanism via externally mounted sliders. Each slider has an electric push rod on one side, connected to the welding table via a fixed seat externally mounted on the upper surface of the welding table. A plasma welding device is externally connected to the ball screw sliding mechanism via a sliding table. A carriage is fixedly mounted on the upper surface of the welding table, away from the plasma welding device. This invention achieves control over the surface temperature of the battery pack during welding, effectively suppressing local overheating and ensuring cell safety and product consistency. It is particularly suitable for welding high-density, high-sensitivity workpieces such as new energy vehicle battery packs.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, and specifically discloses a single-sided welding device for battery pack assembly. Background Technology

[0002] In the field of new energy vehicles and energy storage systems, the battery pack, as the core energy carrier, is crucial for the reliability and safety of its structure. A battery pack assembly typically consists of multiple battery modules, a casing, and electrical connection components. During production, welding is often required to achieve casing sealing, terminal connection, or module fixation. Currently, the industry widely adopts micro-beam plasma welding technology for single-sided welding of components such as battery pack covers and end plates. This technology, with its advantages of concentrated energy, large weld depth-to-width ratio, and relatively narrow heat-affected zone, enables efficient and precise welding operations.

[0003] However, as battery pack energy density continues to increase and structural designs become increasingly compact, the distribution of welding points is also becoming denser. While generating extremely high temperatures to complete the welding process, the micro-plasma arc also continuously conducts a large amount of heat to the workpiece. During continuous, multi-point welding above the battery pack, the accumulated heat can easily cause the overall temperature of the battery pack's upper surface to rise rapidly. Since the battery cells inside the pack are extremely sensitive to temperature, excessively high temperatures can not only affect the consistency of cell performance but also accelerate electrolyte decomposition, damage the separator, and even induce thermal runaway risks, seriously threatening the safety and lifespan of the battery pack.

[0004] Currently, common welding cooling methods mainly focus on water cooling or air cooling of the plasma welding torch body, aiming to protect the welding torch from overheating damage, but failing to effectively solve the problem of temperature rise in the welding area. Although air cooling or ventilation is sometimes used to cool the workpiece, these traditional cooling methods have significant shortcomings: First, the cooling response is sluggish, making it impossible to make immediate and precise adjustments based on real-time changes in the welding point temperature; second, the cooling area is relatively diffuse, making it difficult for the airflow to be concentrated on the small and rapidly moving high-temperature welding point, resulting in low cooling efficiency; third, there is a lack of closed-loop temperature control linked to the welding process, making it impossible to achieve precise "point-to-point" temperature control, which can easily cause localized overheating or uneven cooling on the battery pack surface.

[0005] Therefore, there is an urgent need in the existing technology for a solution that can be synchronized with high-density plasma welding process to achieve rapid response and precise directional cooling, so as to effectively suppress the temperature rise of the battery pack during the welding process, ensure the stability and safety of the battery cells, and thus meet the stringent requirements of high-performance battery pack manufacturing for process reliability. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the background art, and to propose a single-sided welding device for battery pack assembly, including a welding table. Two rails are mounted on both ends of one side of the welding table. The two rails are connected to a ball screw sliding mechanism via externally slidable sliders mounted on the upper surface. An electric push rod is provided on one side of each of the two sliders. The electric push rod is connected to the welding table via a fixed seat externally fixed to the upper surface of the welding table. A plasma welding device is externally connected to the ball screw sliding mechanism via a sliding table. The upper surface of the welding table is located away from the plasma welding device. A slide is fixedly installed on one side of the workpiece. The slide is slidably connected to a support via a push cylinder fixedly installed at one end. Both sides of the support are provided with clamping parts for fixing the workpiece. A side frame is fixedly installed on one side of the support. An suction fan for drawing welding fumes is fixedly installed above the side frame. A frame is fixedly installed on the outside of the side frame. The frame is connected to a U-shaped frame via a connecting part. The U-shaped frame is connected to a slide rod via an internal reciprocating mechanism. A connecting seat is provided at the end of the slide rod away from the U-shaped frame. A temperature monitoring element is provided on the lower surface of the connecting seat. A fixed-point cooling element is provided on the connecting seat.

[0007] In the above technical solution, the clamping component further includes an L-shaped platform fixedly installed on the outer side of one end of the frame, a clamping cylinder fixedly installed on the outer surface of the L-shaped platform, a clamping rod fixedly installed on the telescopic end of the clamping cylinder, a clamping roller fixedly installed inside the clamping rod, and a control cabinet fixedly installed on one side of the outer wall of the welding table.

[0008] In the above technical solution, the connector further includes two clamps that are fixedly installed in the middle of the outside of the frame, and the ends of the two clamps away from the frame are connected to the outer wall of the U-shaped frame.

[0009] In the above technical solution, the reciprocating mechanism further includes a screw that rotates inside the U-shaped frame, a motor is fixedly installed at one end of the U-shaped frame, the output shaft of the motor is fixedly connected to one end of the screw, and the slide bar is threadedly engaged with the screw through an internally threaded hole.

[0010] In the above technical solution, the temperature monitoring device further includes infrared temperature probes that are installed at equal intervals along the horizontal direction on the lower surface of the connector, and a temperature signal transmission sensor is fixedly installed on the upper surface of one end of the connector.

[0011] In the above technical solution, the fixed-point cooling component further includes a frame fixedly installed on the upper surface of the connecting seat. A reciprocating cylinder is fixedly embedded in one end of the frame. A bracket is fixedly provided at the telescopic end of the reciprocating cylinder. A lifting and abutting component is provided inside the bracket on the side near the connecting seat.

[0012] In the above technical solution, the lifting and abutting component further includes a lifting cylinder fixedly installed above the bracket. A slide cylinder is fixedly provided at the telescopic end of the lifting cylinder. An L-shaped rod is movably provided inside the slide cylinder. A buffer spring is fitted on the outside of the L-shaped rod. A fixing pin is threaded through one side of the inside of the slide cylinder. One end of the fixing pin extends into the inside of the L-shaped rod. An L-shaped patch is fixedly provided at the end of the L-shaped rod away from the slide cylinder. A semiconductor cooler is fixedly provided above the L-shaped patch.

[0013] In the above technical solution, the bracket and the platform are slidably fitted together, and a scraper for scraping off dirt from the bottom of the L-shaped patch is fixedly provided on the outer surface of the bracket at the end away from the slide cylinder. The scraper has a wavy shape.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by incorporating a temperature monitoring component and a point-to-point cooling component, enables real-time monitoring and rapid response of the welding area temperature. When the infrared temperature probe detects that the temperature of the weld point or adjacent area exceeds a set threshold, the point-to-point cooling component is immediately activated. This utilizes a semiconductor cooler to provide precise and directional contact cooling to the high-temperature area, effectively suppressing heat accumulation during the welding process and preventing excessive overall temperature rise in the battery pack, thereby ensuring the safety and consistency of the internal battery cells.

[0015] 2. This invention employs a contact cooling method combining a semiconductor cooler and an L-shaped patch. The cooling effect is directly concentrated on the high-temperature solder joint, significantly improving heat exchange efficiency compared to traditional air cooling or pneumatic cooling, and enabling precise "point-to-point" temperature control. Combined with a buffer spring and an adjustable lifting and lowering component, it can adapt to workpieces of different heights and surfaces, ensuring a tight fit between the cooling patch and the solder joint area, thus improving cooling uniformity and effectiveness.

[0016] 3. This invention uses a reciprocating mechanism to drive the slide bar and connecting seat to move synchronously along the welding direction, enabling the temperature monitoring and cooling device to follow the trajectory of the plasma welding device, achieving dynamic tracking and real-time cooling. This linkage design overcomes the shortcomings of traditional cooling methods, such as lag and incomplete coverage, and is particularly suitable for high-density, continuous welding operations, enhancing the coordination and automation level of process connections.

[0017] 4. This invention features a corrugated scraper on the support, which rotates to the other side of the support when the cooling pad detaches from the workpiece surface. This automatically scrapes away any weld slag, oxides, or other contaminants that may be attached to the bottom of the pad, keeping it clean and ensuring efficient heat transfer during the next contact. This self-cleaning function further improves the stability and durability of the cooling system, reduces the frequency of manual maintenance, and is beneficial for continuous and stable mass production. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point A in the middle; Figure 4 This is a schematic diagram of the working state of the clamping component of the present invention when holding the workpiece; Figure 5 This is a schematic diagram of the connection structure between the U-shaped frame and the reciprocating mechanism of the present invention; Figure 6 This is another schematic diagram of the connection structure between the U-shaped frame and the reciprocating mechanism of the present invention; Figure 7 This is a schematic diagram of the connection structure between the bracket and the fixed-point cooling component of the present invention; Figure 8 This is a schematic diagram of the internal connection structure between the slide cylinder and the L-shaped rod of the present invention.

[0019] In the diagram: 1. Welding table; 2. Control cabinet; 3. Slide table; 4. Rail; 5. Fixed seat; 6. Ball screw sliding mechanism; 7. Electric push rod; 8. Bracket; 9. Push cylinder; 10. Frame; 11. Suction fan; 12. Side frame; 13. Slider; 14. Clamping rod; 15. U-shaped frame; 16. Plasma welding device; 17. Slide carriage; 18. Semiconductor cooler; 19. Slide cylinder; 20. Slide rod; 21. Clamping rod; 22. Stand; 23. Reciprocating cylinder; 24. Connecting seat; 25. L-shaped patch; 26. Infrared temperature probe; 27. Stand; 28. Clamping cylinder; 29. ​​L-shaped table; 30. Buffer spring; 31. Screw; 32. L-shaped rod; 33. Lifting cylinder; 34. Fixing pin; 35. Motor; 36. Scraper; 37. Abutment roller. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0022] like Figures 1-8The single-sided welding device for a battery pack assembly shown includes a welding table 1. Two rails 4 are mounted on both ends of one side of the welding table 1. The two rails 4 are connected to a ball screw sliding mechanism 6 via externally slidable sliders 13. Electric push rods 7 are provided on one side of each slider 13. The electric push rods 7 are connected to the welding table 1 via externally fixed seats 5 fixedly mounted on the upper surface of the welding table 1. A plasma welding device 16 is connected to the ball screw sliding mechanism 6 via a sliding table 3. A slide frame 17 is fixedly mounted on the upper surface of the welding table 1, away from the plasma welding device 16. The slide frame 17 is slidably connected to a support 27 via a push cylinder 9 fixedly mounted at one end. Both sides of the support 27 are provided with workpiece clamping members. A side frame 12 is fixedly installed on one side, and an suction fan 11 for drawing welding fumes is fixedly installed above the side frame 12. A frame 10 is fixedly installed outside the side frame 12. A U-shaped frame 15 is connected to the frame 10 through a connecting piece. A slide rod 20 is connected to the U-shaped frame 15 through an internal reciprocating mechanism. A connecting seat 24 is provided at the end of the slide rod 20 away from the U-shaped frame 15. A temperature monitoring device is provided on the lower surface of the connecting seat 24. A fixed-point cooling device is provided on the connecting seat 24. The clamping device includes an L-shaped platform 29 fixedly installed on the outer side of one end of the frame 27. A clamping cylinder 28 is fixedly installed on the outer surface of the L-shaped platform 29. A clamping rod 14 is fixedly installed at the telescopic end of the clamping cylinder 28. A clamping roller 37 is fixedly installed inside the clamping rod 14. A control cabinet 2 is fixedly installed on one side of the outer wall of the welding table 1. In this embodiment, during welding, the battery pack assembly workpiece is placed on the support 27, and the clamping cylinders 28 on both sides are activated simultaneously, pushing the clamping rod 14 and the abutment roller 37 to apply clamping force from both sides of the workpiece. The design of the abutment roller 37 provides reliable clamping force while allowing slight rolling when fine-tuning of the workpiece position is required, reducing frictional damage; The ball screw sliding mechanism 6 can drive the slide table 3 and the plasma welding device 16 to move horizontally. At the same time, the two electric push rods 7 can extend and retract synchronously, driving the entire ball screw sliding mechanism 6 and the plasma welding device 16 to make fine adjustments along the outside of the frame rail 4, thereby realizing the precise positioning and path planning of the plasma welding device 16 in the two-dimensional plane. During the welding process, the suction fan 11 on the side frame 12 can suck in and remove the welding fumes and a small amount of spatter, keeping the working environment clean. It should be noted that one end of the suction fan 11 can be connected to an external hose for discharge in non-working areas. With the installation of the push cylinder 9, the frame 27 can be driven to slide along the slide 17 to send the workpiece into or out of the welding station.

[0023] The connector includes two locking rods 21 that are fixedly installed in the middle of the outside of the frame 10, and the ends of the two locking rods 21 away from the frame 10 are connected to the outer wall of the U-shaped frame 15. In this embodiment, during welding, the U-shaped frame 15 on one side can be erected above one side of the welding area by means of the clamp 21, and is used in conjunction with the drive component inside the U-shaped frame 15.

[0024] The reciprocating mechanism includes a screw 31 that rotates and passes through the inside of the U-shaped frame 15. A motor 35 is fixedly installed at one end of the outside of the U-shaped frame 15. The output shaft of the motor 35 is fixedly connected to one end of the screw 31. The slide bar 20 is threadedly engaged with the screw 31 through an internal threaded hole. The temperature monitoring device includes an infrared temperature probe 26 that is installed at equal distances along the horizontal direction on the lower surface of the connecting seat 24. A temperature signal transmission sensor is fixedly installed on the upper surface of one end of the connecting seat 24. In this embodiment, during the welding process, the motor 35 is started, driving the slide bar 20 and its end connector 24 to move along the length of the U-shaped frame 15. By adjusting the speed and direction of the motor 35, the movement trajectory of the connector 24 can be synchronized with the welding trajectory of the plasma welding device 16 in front, or maintained at a fixed following distance. This allows the infrared temperature probe 26 to scan the weld point and its heat-affected zone in real time, achieving dynamic temperature monitoring. It should be noted that the temperature signal transmission sensor can be connected to an external control device via wires, thereby allowing for temperature preset and monitoring.

[0025] The fixed-point cooling component includes a frame 22 fixedly installed on the upper surface of the connecting seat 24. A reciprocating cylinder 23 is fixedly embedded in one end of the frame 22. A bracket 8 is fixedly installed at the telescopic end of the reciprocating cylinder 23. A lifting and abutting component is installed inside the bracket 8 on the side close to the connecting seat 24. The lifting and abutting component includes a lifting cylinder 33 fixedly installed above the bracket 8. A slide cylinder 19 is fixedly installed at the telescopic end of the lifting cylinder 33. An L-shaped rod 32 is movably installed inside the slide cylinder 19. A buffer spring 30 is fitted on the outside of the L-shaped rod 32. A fixing pin 34 is threaded through one side of the slide cylinder 19. One end of the fixing pin 34 extends into the interior of the L-shaped rod 32. An L-shaped patch 25 is fixedly installed at the end of the L-shaped rod 32 away from the slide cylinder 19. A semiconductor cooler 18 is fixedly installed above the L-shaped patch 25. In this embodiment, the reciprocating cylinder 23 drives the bracket 8 to move laterally in the horizontal plane relative to the connecting seat 24, thereby driving the lower slide cylinder 19 and L-shaped rod 32 to capture the point. Then, driven by the lifting cylinder 33, the slide cylinder 19 and L-shaped rod 32 move up and down. The upper part of the L-shaped rod 32 is movably inserted into the slide cylinder 19, and the two can slide relative to each other. Outside the L-shaped rod 32, a buffer spring 30 is fitted between the inner top wall of the slide cylinder 19 and the shoulder of the L-shaped rod 32. A fixing pin 34 is screwed into the slide cylinder 19 from the side thread and inserted into the hole on the side of the L-shaped rod 32 to lock the position of the L-shaped rod 32 in the non-working state, preventing it from falling freely and rotating. When the L-shaped rod 32 drives the L-shaped patch 25 to move down, the buffer spring 30 ensures that the L-shaped patch 25 maintains a moderate and constant contact pressure when it is in contact with the welding area, ensuring good thermal contact while avoiding damage to the workpiece.

[0026] The L-shaped patch 25 is made of a high thermal conductivity material. Its lower surface is used to contact the workpiece. Specifically, when the semiconductor cooler 18 is powered on, its cold end cools down rapidly. The cooling energy is directly and efficiently conducted to the high-temperature solder joints on the surface of the workpiece through the high thermal conductivity L-shaped patch 25, achieving rapid local cooling. The hot end of the semiconductor cooler 18 is connected to a heat dissipation cavity, and heat dissipation fins are provided inside the heat dissipation cavity. After the temperature drops, the lifting cylinder 33 retracts, causing the L-shaped patch 25 to detach from the workpiece. Subsequently, the reciprocating cylinder 23 retracts, causing the bracket 8 and the L-shaped patch 25 to retract.

[0027] The bracket 8 and the platform 22 are slidably fitted together. A scraper 36 for scraping off dirt from the bottom of the L-shaped patch 25 is fixedly provided on the outer surface of the end of the bracket 8 away from the slide cylinder 19. The scraper 36 has a wavy shape. In this embodiment, the scraper 36 is preferably made of an elastic and wear-resistant material, and its cutting edge is designed in a wavy shape so that it can better adapt to the curvature of the bottom surface of the L-shaped patch 25 and effectively scrape away dirt. When cleaning is needed, it retracts to the initial position under the drive of the reciprocating cylinder 23, at which time the scraper 36 can scrape the bottom of the L-shaped patch 25; Specifically, the fixing pin 34 is removed from the inside of the slide cylinder 19 and the L-shaped rod 32, and then the L-shaped rod 32 is rotated to the other end of the bracket 8. At this time, the bottom of the L-shaped patch 25 will contact the blade of the scraper 36 during the rotation, thereby achieving the purpose of scraping off dirt.

[0028] It should be noted that the control device of the present invention is a control cabinet 2, an external control device PLC controller, signal connectors and wires, and a control panel to realize the control function.

[0029] Working principle: The battery pack assembly to be welded is placed on the support 27. The clamping cylinder 28 is activated, its telescopic end pushing the clamping rod 14 and the abutment roller 37 mounted on it to move laterally towards the workpiece, clamping and fixing it to the support 27 from both sides. The design of the abutment roller 37 helps reduce friction and facilitates fine-tuning and alignment of the workpiece. Subsequently, the plasma welding device 16 is activated. The ball screw sliding mechanism 6 drives the slide table 3 and the plasma welding device 16 on it to move linearly in the horizontal direction. Simultaneously, the electric push rod 7 can push or pull the slider 13, thereby fine-tuning the position of the ball screw sliding mechanism 6 and the plasma welding device 16 in the direction of the rail 4, achieving bidirectional positioning for welding. During welding, the suction fan 11 is activated, drawing away the welding fumes through the side frame 12 area. While the plasma welding device 16 is performing welding operations, multiple infrared temperature probes 26 mounted on the lower surface of the connecting seat 24 scan the welding area and heat-affected zone passing below in real time from one side. The monitored temperature data is transmitted to the control device inside the control cabinet 2 via a temperature signal transmission sensor. To enable the temperature monitoring to follow the movement of the welding point, the control motor 35 is started. The motor 35 drives the screw 31 to rotate inside the U-shaped frame 15. Through its engagement with the threaded hole inside the slide rod 20, the motor 35 drives the slide rod 20 and its end connecting seat 24, temperature monitoring component, and fixed-point cooling component to move synchronously or at a specific distance along the length of the U-shaped frame 15 in the welding direction, thus achieving dynamic tracking. When the infrared temperature probe 26 detects that the temperature of a solder joint or surrounding area exceeds a preset safety threshold, the control device immediately triggers the action of the fixed-point cooling component. First, the reciprocating cylinder 23 pushes the bracket 8 to move horizontally along the platform 22 towards the high-temperature point, aligning the cooling unit with the target position. Next, the lifting cylinder 33 actuates, pushing the slide cylinder 19 and the internal L-shaped rod 32 downward. Under the buffering action of the buffer spring 30, the L-shaped patch 25 at the bottom of the L-shaped rod 32 gently and tightly adheres to the high-temperature area on the workpiece surface. After the semiconductor cooler 18 is powered on, its cold end rapidly cools down, and the cooling energy is directly conducted to the high-temperature solder joint position on the workpiece surface through the L-shaped patch 25 with good thermal conductivity, achieving rapid and precise contact forced cooling. Once the monitored temperature drops to a safe range, the lifting cylinder 33 retracts, causing the L-shaped patch 25 to detach from the workpiece surface. Finally, after completing the welding and cooling at the current station, the clamping cylinder 28 retracts, releasing the workpiece. The pushing cylinder 9 then actuates, moving the support 27 and the processed workpiece along the slide 17 one station, or removing the workpiece from the processing area. Subsequently, the device resets, ready for the next workpiece welding cycle.

[0030] It should be noted that after welding, in order to ensure that the L-shaped patch 25 can fully adhere to the workpiece surface to absorb heat, the fixing pin 34 can be removed, and then the L-shaped rod 32 can be rotated to the corrugated scraper 36 at the other end of the bracket 8. When the L-shaped rod 32 rotates, the bottom of the L-shaped patch 25 will contact the corrugated scraper 36, thereby scraping the bottom of the L-shaped patch 25 and removing the spatter, oxide layer and other contaminants that may have adhered to the patch during the welding process. This ensures that the heat conduction interface of the L-shaped patch 25 is clean when it contacts the workpiece again, and maintains stable cooling efficiency.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A single-sided welding device for a battery pack assembly, comprising a welding table (1), characterized in that: The welding table (1) is equipped with rails (4) at both ends on one side. The two rails (4) are connected to a ball screw sliding mechanism (6) by sliding blocks (13) mounted on the outside. Each of the two sliding blocks (13) is equipped with an electric push rod (7). The electric push rod (7) is connected to the welding table (1) by a fixed seat (5) fixedly mounted on the upper surface of the welding table (1). The ball screw sliding mechanism (6) is connected to a plasma welding device (16) by a sliding table (3). A slide (17) is fixedly mounted on the upper surface of the welding table (1) on the side away from the plasma welding device (16). The slide (17) is connected to a push cylinder fixedly mounted at one end. 9) A sliding connection is provided with a frame (27), and a clamping member for fixing the workpiece is provided on both sides of the frame (27). A side frame (12) is fixedly provided on one side of the frame (27). An suction fan (11) for drawing welding fumes is fixedly provided above the side frame (12). A frame (10) is fixedly provided on the outside of the side frame (12). A U-shaped frame (15) is connected to the frame (10) through a connecting member. A slide rod (20) is connected to the U-shaped frame (15) through a reciprocating mechanism provided inside. A connecting seat (24) is provided at the end of the slide rod (20) away from the U-shaped frame (15). A temperature monitoring member is provided on the lower surface of the connecting seat (24). A fixed-point cooling member is provided on the connecting seat (24).

2. The battery pack assembly single-sided welding device according to claim 1, characterized in that: The clamping component includes an L-shaped platform (29) fixedly installed on the outer side of one end of the frame (27). A clamping cylinder (28) is fixedly installed on the outer surface of the L-shaped platform (29). A clamping rod (14) is fixedly installed on the telescopic end of the clamping cylinder (28). A clamping roller (37) is fixedly installed inside the clamping rod (14). A control cabinet (2) is fixedly installed on one side of the outer wall of the welding table (1).

3. The battery pack assembly single-sided welding device according to claim 1, characterized in that: The connector includes two clamps (21) that are fixedly installed in the middle of the outside of the frame (10), and the ends of the two clamps (21) away from the frame (10) are connected to the outer wall of the U-shaped frame (15).

4. The battery pack assembly single-sided welding device according to claim 1, characterized in that: The reciprocating mechanism includes a screw (31) that rotates and passes through the inside of a U-shaped frame (15). A motor (35) is fixedly installed at one end of the outside of the U-shaped frame (15). The output shaft of the motor (35) is fixedly connected to one end of the screw (31). The slide rod (20) is threadedly engaged with the screw (31) through a threaded hole opened inside.

5. The battery pack assembly single-sided welding device according to claim 1, characterized in that: The temperature monitoring device includes an infrared temperature probe (26) installed at equal intervals along the horizontal direction on the lower surface of the connector (24), and a temperature signal transmission sensor is fixedly installed on the upper surface of one end of the connector (24).

6. The battery pack assembly single-sided welding device according to claim 1, characterized in that: The fixed-point cooling component includes a frame (22) fixedly installed on the upper surface of the connecting seat (24). A reciprocating cylinder (23) is fixedly embedded in one end of the frame (22). A bracket (8) is fixedly provided at the telescopic end of the reciprocating cylinder (23). A lifting and abutting component is provided inside the bracket (8) on the side close to the connecting seat (24).

7. A single-sided welding device for a battery pack assembly according to claim 6, characterized in that: The lifting and abutting component includes a lifting cylinder (33) fixedly installed above the bracket (8). A slide cylinder (19) is fixedly provided at the telescopic end of the lifting cylinder (33). An L-shaped rod (32) is movably provided inside the slide cylinder (19). A buffer spring (30) is fitted on the outside of the L-shaped rod (32). A fixing pin (34) is threaded through one side of the slide cylinder (19). One end of the fixing pin (34) extends into the interior of the L-shaped rod (32). An L-shaped patch (25) is fixedly provided at the end of the L-shaped rod (32) away from the slide cylinder (19). A semiconductor cooler (18) is fixedly provided above the L-shaped patch (25).

8. A single-sided welding device for a battery pack assembly according to claim 7, characterized in that: The bracket (8) and the platform (22) slide together. A scraper (36) for scraping off dirt from the bottom of the L-shaped patch (25) is fixedly provided on the outer surface of the bracket (8) away from the slide cylinder (19). The scraper (36) has a wavy shape.

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